Shuttle for ribbon-looms.



No. 809,564. PATENTED JAN. 9, 1906.

W. HAUSMANN.

SHUTTLE FOR RIBBON LOOMS.

APPLICATION FILED APEZI, 1905.

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UNITED STATES PATENT OFFICE.

SHUTTLE FOR RIBBON-LOOMS- Specification of Letters Patent.

rammed Jan. 9, 1906.

Application filed April 21 1905. Serial No. 256.692.

To all whom it may concern;

Be it known that I, WILHELM HAUSMANN, a citizen of the German Em ire, residing at Barmen, in the Province of henish Prussia and Kingdom of Prussia, Germany, have invented certain new and useful Improvements in Shuttles for Ribbon-Looms, of which the following is a specification.

This invention relates to im rovements in shuttles for ribbon-looms; an it has for its object to enable the thread of the bobbin to be pulled off the latter always at right angles, or nearly so, to the geometrical axis of the bobbin in order to attain an almost uniform tension of the thread and that said tension may be reduced to as little as possible, so as to allow the use of very fine threads or yarn of very little tensile strength. At-

, tempts in this direction have been made in various forms and by various means. By means of the present invention the result aimed at is attained by insertin behind the bobbinthat is, between the bo bin and the back cross-stay of the shuttlea threadguide of peculiar shapethat is, of a form resembling part of a paraboloidover the convex part of which the thread coming from the bobbin is guided before it enters the outlet-eye in the front stay of the shuttle. This guide is of doublecurved formthat is to say, in longitudinal direction and in radial directionwith a view that the part of thread which is in contact with the guide will be always of equal length, or nearly so, whether it is pulled off from either end of the bobbin or from the central part of the same.

On the accompanying drawings the new shuttle is shown in a view in plan in Fig. 1, in Fig. 2 in a section along line I I of Fig. 1, and Fig. 3 shows a sectional part of the bobbin with the guide therein seen from the inner or top side of Figs. 1 or 2.

In the shuttle A the bobbin B is held rotatively on the thin spindle C, so that it can be conveniently put in place or taken ofl. A light brake-plate D, held on an arm E, is pressed against the circumference of the bobbin by a spring F. This is of ordinary and well-known design, and it may be replaced by another device of known construction in shuttles for the same purpose. 1 It does not form art of the resent invention. Now

behin or below t e bobbinI arrange the thread-guide G, which by its ends is rigidly fixed to the body of the shuttle. This thread-guide, as will be seen from Figs. 1, 2, and 3, is of fish-beam or fish-belly shape in its longitudinal direction, the curve beinga parabola. In cross-sectionit is scoop-shaped, with inverted edges, the form of the curvature being again also in this direction of parabolic shape. Now the thread pulled from the bobbin 'is first drawn backward over the convex part of the guide G and thence forward through the eye H, whence it is laid in the shed of the weaving. As will be seen from Fig. 1 in full and dotted lines, the thread is in any place pulled ofl at right angles from the bobbin, and by reason of the parabolic shape of the guide G the length of thread between bobbin B and eye H remains constant, and it is so guided that hardly any friction is caused on the smooth surface of the guide, so that the tensile strain to which the thread is exposed is in all parts the same and almost null. This allows not only the use of yarn of greatest fineness-finest silk, for instance-but it has that influence on such fine weavings that the edges of silk ribbons, for instance, will be absolutely straight and uniform, and it allows a greater speed to be used, because the danger of breaking the thread is reduced. In order to keep the weight of the shuttle as low as ossible, I make the thread-guide, by pre erence, of aluminium sheet.

I am aware that devices for reducing the friction and the strain on the thread pulled off from the bobbins in a shuttle have been known, and I do not claim generally such device; but

What I do claim is In a shuttle for looms, theshuttle-body provided with a thread-guide G fixed rigidly to the body of the shuttle behind the bobbin B and of parabolic shape in its longitudinal direction and also in transverse direction on the rear part of the same, the whole as described and illustrated and for the purpose set forth.

In testimony whereof I have affixed my signature in presence of two witnesses.

WILHELM HAUSMANN.

Witnesses:

OTTo KoNIG, J. A. RITTERSHAUS. 

